piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ be583a34a3815c2c10e86094ab0610e4b7f9c869

Chelsea Holland Komlo be583a34a3 use tor allocator for string allocation in rust		6 lat temu
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tests	d1820c1516 rust implementation of protover	6 lat temu
Cargo.toml	be583a34a3 use tor allocator for string allocation in rust	6 lat temu
ffi.rs	be583a34a3 use tor allocator for string allocation in rust	6 lat temu
include.am	d1820c1516 rust implementation of protover	6 lat temu
lib.rs	be583a34a3 use tor allocator for string allocation in rust	6 lat temu
protover.rs	be583a34a3 use tor allocator for string allocation in rust	6 lat temu